Hyper Phosphor Bronze C5240(HP)

C5240(HP) Phosphor bronze designed for springs with high mechanical strength



We have improved conventional phosphor bronze (C5240) to develop hi-performance phosphor bonze (C5240-HP). The C5240 alloy is a phosphor bronze with 10% tin-containing, and has better mechanical strength and bend formability that the C5210 alloy, a phosphor bonze with 8%-tin-containing. Our technologies to enhance characteristics of alloys have created C5240-HP with improved bend formability. Mechanical strength of C5240-HP can satisfy demands of such electronic components as miniaturized switches, connectors and relays
We offer Hi-performance series, which consist of highly functional materials with dramatically improved characteristics elaborated through precision product process, without changing chemical compositions.

Table 1. Chemical Composition of C5240-HP (Wt%)

  Cu Sn P Fe Pb Cu+Sn+P
Typical Balance 10.0 0.15 ≦ 0.10 ≦ 0.05 ≧ 99.7

Table 2.Physical Properties of C5240-HP

Electric conductivity 10 %IACS(@20℃)
Specific resistance 157 nΩ ・ m(@20℃)
Thermal conductivity 50 W/mK
Thermal expansion coefficient 18.4 ×10-6/K(20 to 300℃)
Young's modulus 100 GPa
Density 8.78 g/cm3

Table 3. Mechanical Properties of C5240-HP(Specifications)

Temper Tensile Strength
0.2% offset Yield Strength
Vickers Hardness
H 650-750 580-690 ≧11 200-240
EH 750-850 650-790 ≧9 230-270
SH 850-950 780-920 ≧5 250-290
ESH 950-1,050 900-1030 ≧1 270-310
XSH 1,000-1,200 950-1190 Rec. 290min